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block/vdi: Don't take address of fields in packed structs 

Taking the address of a field in a packed struct is a bad idea, because
it might not be actually aligned enough for that pointer type (and
thus cause a crash on dereference on some host architectures). Newer
versions of clang warn about this. Avoid the bug by not using the
"modify in place" byte swapping functions.

There are a few places where the in-place swap function is
used on something other than a packed struct field; we convert
those anyway, for consistency.

Patch produced with scripts/coccinelle/inplace-byteswaps.cocci.

There are other places where we take the address of a packed member
in this file for other purposes than passing it to a byteswap
function (all the calls to qemu_uuid_*()); we leave those for now.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Peter Maydell 2018-10-16 18:25:03 +01:00 committed by Kevin Wolf
parent 1229e46d3c
commit 091901841a
1 changed files with 32 additions and 32 deletions
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64
block/vdi.c
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@ -187,22 +187,22 @@ typedef struct {
static void vdi_header_to_cpu(VdiHeader *header)
{
le32_to_cpus(&header->signature);
le32_to_cpus(&header->version);
le32_to_cpus(&header->header_size);
le32_to_cpus(&header->image_type);
le32_to_cpus(&header->image_flags);
le32_to_cpus(&header->offset_bmap);
le32_to_cpus(&header->offset_data);
le32_to_cpus(&header->cylinders);
le32_to_cpus(&header->heads);
le32_to_cpus(&header->sectors);
le32_to_cpus(&header->sector_size);
le64_to_cpus(&header->disk_size);
le32_to_cpus(&header->block_size);
le32_to_cpus(&header->block_extra);
le32_to_cpus(&header->blocks_in_image);
le32_to_cpus(&header->blocks_allocated);
header->signature = le32_to_cpu(header->signature);
header->version = le32_to_cpu(header->version);
header->header_size = le32_to_cpu(header->header_size);
header->image_type = le32_to_cpu(header->image_type);
header->image_flags = le32_to_cpu(header->image_flags);
header->offset_bmap = le32_to_cpu(header->offset_bmap);
header->offset_data = le32_to_cpu(header->offset_data);
header->cylinders = le32_to_cpu(header->cylinders);
header->heads = le32_to_cpu(header->heads);
header->sectors = le32_to_cpu(header->sectors);
header->sector_size = le32_to_cpu(header->sector_size);
header->disk_size = le64_to_cpu(header->disk_size);
header->block_size = le32_to_cpu(header->block_size);
header->block_extra = le32_to_cpu(header->block_extra);
header->blocks_in_image = le32_to_cpu(header->blocks_in_image);
header->blocks_allocated = le32_to_cpu(header->blocks_allocated);
qemu_uuid_bswap(&header->uuid_image);
qemu_uuid_bswap(&header->uuid_last_snap);
qemu_uuid_bswap(&header->uuid_link);
@ -211,22 +211,22 @@ static void vdi_header_to_cpu(VdiHeader *header)
static void vdi_header_to_le(VdiHeader *header)
{
cpu_to_le32s(&header->signature);
cpu_to_le32s(&header->version);
cpu_to_le32s(&header->header_size);
cpu_to_le32s(&header->image_type);
cpu_to_le32s(&header->image_flags);
cpu_to_le32s(&header->offset_bmap);
cpu_to_le32s(&header->offset_data);
cpu_to_le32s(&header->cylinders);
cpu_to_le32s(&header->heads);
cpu_to_le32s(&header->sectors);
cpu_to_le32s(&header->sector_size);
cpu_to_le64s(&header->disk_size);
cpu_to_le32s(&header->block_size);
cpu_to_le32s(&header->block_extra);
cpu_to_le32s(&header->blocks_in_image);
cpu_to_le32s(&header->blocks_allocated);
header->signature = cpu_to_le32(header->signature);
header->version = cpu_to_le32(header->version);
header->header_size = cpu_to_le32(header->header_size);
header->image_type = cpu_to_le32(header->image_type);
header->image_flags = cpu_to_le32(header->image_flags);
header->offset_bmap = cpu_to_le32(header->offset_bmap);
header->offset_data = cpu_to_le32(header->offset_data);
header->cylinders = cpu_to_le32(header->cylinders);
header->heads = cpu_to_le32(header->heads);
header->sectors = cpu_to_le32(header->sectors);
header->sector_size = cpu_to_le32(header->sector_size);
header->disk_size = cpu_to_le64(header->disk_size);
header->block_size = cpu_to_le32(header->block_size);
header->block_extra = cpu_to_le32(header->block_extra);
header->blocks_in_image = cpu_to_le32(header->blocks_in_image);
header->blocks_allocated = cpu_to_le32(header->blocks_allocated);
qemu_uuid_bswap(&header->uuid_image);
qemu_uuid_bswap(&header->uuid_last_snap);
qemu_uuid_bswap(&header->uuid_link);